@ OP: I have no idea what you are trying to say. To some how suggest that 1 faction can not beat the other (and there is only 2) is just ridiculous. In 1v1 covenant can beat UNSC if you play it right. 2v2 you should balance your team by having 1 UNSC and 1 covy (in most cases Arbiter). 3v3 is whatever, but your attacks have to be well carried out.

Through logic covenant can beat UNSC. Early game is covy's strength. So what that means is you should be trying to get an advantage over the UNSC player early game. This can be done by harassing, rushing, and taking/preventing early map control. If you let the game drag on without doing enough its on you.